[英]Listening to i2c input changes with python
Let's say I have a raspberry pi here and I want to write a Python script that turns on the light as soon as a i2c signal reaches the pi and some pin gets high. 假设我在这里有一个树莓派,我想编写一个Python脚本,当i2c信号到达pi并且某个引脚变高时,它会立即点亮。 I do not want to use polling for this task, as it could slow down the process (I know just a bit but I'ts just bad practice and puts load on the CPU and so on, so I don't want to permacycle asking for the input state)
我不想为此任务使用轮询,因为它可能会减慢该过程的速度(我知道一点,但我的做法很不好,并且将负载加到CPU上,依此类推,所以我不想让周期询问输入状态)
Is there any kind of server or callback function I could use to realize this with a python script? 我是否可以使用任何类型的服务器或回调函数通过python脚本实现此目的? Which library could I use to reach such a behaviour?
我可以使用哪个库来达到这种目的?
First Ideas are enviromental variables/the i2c Interface in the Linux system that I could listen to constantly somehow and catch it to make it do what I want it to. 第一个想法是环境变量/ Linux系统中的i2c接口,我可以以某种方式不断聆听并捕获它以使其按我的意愿去做。
As I see it no need to use python but I don't see whole picture so I don't know if this will help You, 如我所见,无需使用python,但看不到整个图片,因此我不知道这是否对您有帮助,
just regarding this part of question: 就这部分问题而言:
Is there any kind of server or callback function...
是否有任何类型的服务器或回调函数...
rpio.poll(pin, callback());
Watch pin for changes and execute the callback callback() on events.
监视引脚是否有变化,并在事件上执行回调callback() 。 callback() takes a single argument, the pin which triggered the callback.
callback()有一个参数,即触发回调的引脚。
The optional direction argument can be used to watch for specific events:
可选的direction参数可用于监视特定事件:
rpio.POLL_LOW: poll for falling edge transitions to low.
rpio.POLL_LOW:轮询下降沿转换为低电平。
rpio.POLL_HIGH: poll for rising edge transitions to high.rpio.POLL_HIGH:轮询上升沿到高电平的过渡。
rpio.POLL_BOTH: poll for both transitions (the default).rpio.POLL_BOTH:轮询两个转换(默认)。
Complete documentation - this is the npm module documentation 完整的文档 -这是npm模块文档
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